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Method and device for extracting a signal identifier, method and device for creating a database from signal identifiers and method and device for referencing a search time signal

  • US 20040158437A1
  • Filed: 03/02/2004
  • Published: 08/12/2004
  • Est. Priority Date: 04/10/2001
  • Status: Abandoned Application
First Claim
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1. Method for extracting a signal identifier from a time signal having a harmonic portion, the method comprising:

  • detecting (12) the temporal occurrence of signal edges in the time signal;

    determining (14) a temporal interval between two selected detected signal edges;

    calculating (16) a frequency value from the temporal interval determined, and associating the frequency value with a time of occurrence of the frequency value in the time signal to obtain a coordinate tuple from the frequency value and the time of occurrence for this frequency value; and

    creating (18) the signal identifier from a plurality of coordinate tuples, each coordinate tuple including a frequency value and a time of occurrence, whereby the signal identifier includes a sequence of signal-identifier values which reflects the temporal form of the time signal.

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